Process of making solid sodium bisulfite.



` through outlet ld 4run through wherein it is constantly agitated by the stirrer 9 and subJec-ted to the action of sulfur dioxid, preferably as burner gas, from pipe l0. The excess of gas is pumped out by pump 12 through an absorber, or scrubber 13, containing an alkaline liquid, such as sodium carbonate, wherein any excess of sulfur dioxid is recovered. After the reaction 'in the converting tank 8 is completed, the solution of sodium bisulliteand the suspended solid-.sodium to aV suitable separator, siich as a centrifugal machine, not shown, Where the solid is separated from the solution, and are' then further quickly dried and cooled as above noted. Other alkaline bisultites may also be made in this manner.

claim: p

"1. The process of making solid sodium bisuite, ycomprising treating solid sodium su'litc, substantially tree from sodium carbollate, sus ended in a solution containing a sodiuinlsu tite, with a gas containing sulfur dioxid, thereby converting the suspended sodium suliite into sodium bisulite.

2. The process ,of making solid sodium bisulite, comprising neutralizing sodium bisulte in Ysolution by the restricted addition oi a solid alkaline sodium salt, thereby 'forming solid sodium sulite, substantially free from sodium carbonate, suspended in a solution et Sodium sulite, then react-ing upon the suliites with a gas containing sulfur dioxid, thereby forming solid and dissolved sodium bisuliites, and separating the solid from the dissolved salt.

3. The processore making solid sodium bisulte, comprising neutralizing sodium bisultite in solution by the restricted addition of a solid 'alkaline sodium salt, thereby formvingsolid sodium sulite, substantially free from sodium carbonate, suspended in a solution of sodium sulite, then reacting upon the suh'ites with a gas containing sulfur dioxid, thereby forming solid and dissolved sodium bisuliites, separating the solid bisulte from the solution containing the-dissolved bisuliite, and reusing the solution of bisulte to form more. neutral sodium s'uliite.

4. The process of making a solid bisuli te,

comprisingsuspending a. solid suliite, substantially free from a carbonate in a vehicle, and reacting vupon said suspended 'solid sultite Witha gas containing sulfur dioxid, therebyi'forming a solid bisulte.

The process of making solid sodium bisulfite, comprising bringing together a gas containing sulfur dioxid and solid sodium sulfite, substantially tree from sodium carbonate, suspended in a suitable vehicle.

6. The process or making' solid sodium bisultite, comprising bringing together a gas containing sulfur dioxid and solid sodium pipe 7 lto the converting tank 3 bisuliite are run outsul'ite, substantially free from sodium car.- bonate, suspended ina solution containing suliite.

7. The process of making solid sodium bisultite, comprising bringing together a gas Icontaining' sulfur dioxid and solid sodium sulte, substantially free from sodium carbonate, suspended in a solution containing a sodium salt.

8. The process of making solid sodium bisultite, comprising bringing together a gas containing sulfur dioXid and solid sodium suliite, substantially free from sodium carbonate, suspended in a solution containing sodium sulite.

9. The process of making solid sodium bisuliite, comprising treating sodium suliite, substantially free from sodium carbonate, suspended in afsolution containing a sodium sultite with burner gas, thereby converting the suspended sodium sulite into sodium bisuliite. A

l0. The process of making solid sodium bisuliite, comprising neutralizing sodium bisulfite in solution by the restricted addition of a solid alkaline sodium salt, thereby orming solid sodium sulite, 'substantially :tree :trom sodium carbonate, and a solution of sodium sulte, then'reacting upon the sultites with burner gas, thereby forming solid and dissolved sodium bisulfites, and separating the solid from the dissolved salt.

li. The bisultite, comprising neutralizing sodium bisulte in solution by the restricted addition oi a solid alkaline sodium salt, thereby forming solid sodium sulite, substantially free from sodium carbonate, in a solution of sodium sultite, then reacting upon the suland dissolved sodium bisuliites, separating 'the solid bisuliite from the solution containing the dissolved bisulte, and reusing the sodium suliite.` i

12. The process of making a solid bisultite, comprising suspending a suiiite, substantially free from a carbonate, in a vehicle, and reacting upon said suspended solid lsultite with burner gas, thereby torming a solid bisulte.

13. The process of making solid sodium l bisultite, comprising bringing together and solid sodium sulte, substanburner gas tially free from sodium carbonate, suspended in a. suitable vehicle.

le. The process of making solid sodium bisultite, comprising bringing together burner gas and solid sodium suliite,

tially free :trom sodium carbonate,

suspended in a solution containing sulite. 1o. The process of making solid sodium bisuitite, comprising bringing together l burner gas and solid sodium sulte, substansolution. or" bisuliite'to form more neutral substanf process of making solid Sodium I tites With burner gas, thereoy forming solid lli) tially free from sodium carbonate, suspended in a solution containing a, sodium salt.

16. The process of making Solid sodium bisulte, 5 burner gas and Solid sodium sulte, substantially free from sodium carbonate, suspendi ed in a solution containing sodium sulte.

meej-eee :el:

n testimony whereof I ax my signature `1n presence of two Wltnesses.

HENRY HOWARD.

comprising bringing together Witnesses M. GRAHAM, Y M. V. OBmEN.

1,084,436.-Henry Howard, Boston, Mese. PROCESS' oF MAVKNG SOLID SoDIUM BISULFXTE. Patent dated January 13, 1914. Disclaimer filed June 20,A 1917, by the aesigilemGeneml Chemical U0. l

Enters this disclaimer- To any aspect of all the claims of Letters Faisant .Nol 1,084,486 in so for es they are capable of e. construction which inoludee the subject-*matter described end claimed in the Strlckler patent, No. 1,023,3179, of April i6, 1912.

[Oicial Gazette J uly 3, 1917.] 

